621 The velocity of a particle of mass m of de-Broglie wavelength λ is______________? Physics Medium Full question → A v = 3 ×× 106 ms-1 B v = 2 ×× 10 ms-1 C v = 2 ×× 6 ms-1 D v = 2 ×× 106 ms-1
622 A photon of wavelength 900nm behaves like a particle of mass______________? Physics Medium Full question → A 5.53 x 10-36kg B 0 kg. C 2.46 x 10-36kg D 1.84 x 10-44kg
623 If n number of the photon is striking on a metal surface then total momentum exerted is_______________? Physics Medium Full question → A p B n C 0 D None
624 If a photon is reflected from the mirror then the change in momentum of each photon is_______________? Physics Medium Full question → A Zero B Double C Half D 1
625 If the wavelength of incident radiation is increased in photoemission then_________________? Physics Medium Full question → A The maximum kinetic energy of the photoelectrons increases B The minimum kinetic energy of the photoelectrons decreases C The minimum kinetic energy of the photoelectrons increases D The average kinetic energy of the photoelectrons decreases
626 In a photoelectric effect monochromatic light is incident on a metal surface. If the incident light of twice the intensity but of same wavelength the kinetic energy of the emitted electron_______________? Physics Medium Full question → A Becomes double B Remains same C Becomes half D First increases then decrease because of the curvilinear graph
627 After traveling through a vacuum a photon of light entering into some transparent denser medium. Thus the energy of light______________? Physics Medium Full question → A Increases because wavelength decreases B Decreases because speed decreases C Remains same D Increases then decrease
628 A transmitting station emits radio waves of wavelength λ at power P. If h is Planck’s constant & c the speed of light what is the rate of emission of photons ? Physics Medium Full question → A λ B Speed of sound C Speed of lightB. D h
629 Which one of the following has the largest energy content ? Physics Medium Full question → A 103 photons of wavelength 2 pm (γ-rays) B 102 photons of wavelength 1nm (x-rays) C 106 photons of wavelength 50?m (infrared) D 106 photons of wavelength 200nm (UV)
630 A photon is________________? Physics Medium Full question → A A unit of energy B A positively charged particle C A quantum of electromagnetic radiation D A unit of wavelength
631 Davison Germer experiment indicates__________________? Physics Medium Full question → A Interference B Polarization C Electron diffraction D Refraction
632 In Compton scattering, the change in wavelength is maxed if_______________? Physics Medium Full question → A The angle of scattering is 90° B The angle of scattering is 60° C The angle of scattering is 180° D The angle of scattering is 0
633 The name of the photon for quantum of light was proposed by________________? Physics Medium Full question → A Ampere B Plank C Thomson D Einstein
634 As the temperature of black body is raised the wavelength corresponding to maximum intensity________________? Physics Medium Full question → A shifts towards longer wavelength B shifts towards shorter wavelength C remain the same D shifts towards longer as well as shorter wavelengths
635 Einstein’s photoelectric equation is given by_______________? Physics Medium Full question → A 1/2 mvmax2=hf+Φ B 1/2 mvmax2-hf = Φ C 1/2 mvmax2=hf-Φ D All of above are correct
636 Semi-conductors with donor atoms and free electrons belong to the type________________? Physics Medium Full question → A n B p C mix D any of above
637 The especially designed semiconductor diodes used as indicator lamps in electronic circuits are___________? Physics Medium Full question → A The switch B The light emitting diode C The photo diodes D Solar cells.
638 The device or circuit used for conversion of A.C. into D.C. is called_______________? Physics Medium Full question → A An amplifier. B A rectifier C Filtering circuit D Converter.
639 The semiconductor diode can be used as a rectifier because _______________? Physics Medium Full question → A It has low resistance to the current flow when forward biased & high resistance when reverse biased. B It has low resistance to the current flow when forward biased. C It has high resistance to the current flow when reverse biased D Its conductivity increases with rise of temperature.
640 In the transistor schematic symbol, the arrow_______________? Physics Medium Full question → A is located on the emitter B is located on the base C is locate on the collector D points form north to south